Journal of Soft Computing and Information Technology

Journal of Soft Computing and Information Technology

The Impact of Using the Non-Orthogonal Multiple Access Technique in Collaborative Wireless Cellular Networks on Improving Communication Quality

Document Type : Persian Original Article

Authors
Asma Bagheri
Mohammad Amin Karimi
Faculty of Electrical and Computer Engineering, Esfarayen University of Technology, Esfarayen, North Khorasan, Iran.
10.22034/jscit.2025.219354
Abstract
Collaborative Non-Orthogonal Multiple Access (CNOMA) reduces the probability of outages for cell edge users in wireless networks, where in-cell users are utilized as relays to improve network coverage and increase reliability. In this approach, relays retransmit information to the cell edge users, thereby enhancing signal power through diversity selection. The statistical analysis of outage probability is crucial for evaluating coverage quality and network performance. However, the analysis faces challenges such as the impact of channel fading and Successive Interference Cancellation (SIC). SIC, a key technique in NOMA systems, decodes stronger signals first and subtracts their interference to detect weaker signals, but its performance is highly sensitive to channel conditions, which can lead to error propagation.

Additionally, channel fading significantly impacts outage probability, as it introduces random fluctuations in signal strength, making reliable communication more challenging, especially for cell edge users. Assuming fading channels and the presence of SIC at relay users, this paper presents a closed-form expression for the outage probability of cell edge users. The closed-form expression is evaluated through simulations.
Keywords
Keywords: Outage probability
Collaborative NOMA
Rayleigh fading
Successive Interference Cancellation (SIC)
Wireless cellular networks.  
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Journal of Soft Computing and Information Technology
Volume 14, Issue 1
Spring - June
Spring 2025
Pages 37-44